A weightlifter is lifting weights of mass 200 kg up to a height of 2m ? If g = 9.8 m/s2. Calculate: (i) pe acquired by the weights (ii) wd by the weightlifter.
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(a) Given,✓
Mass, m = 200kg
Mass, m = 200kgAcceleration due to gravity, g = 9.8m/s²
Mass, m = 200kgAcceleration due to gravity, g = 9.8m/s²Height, h = 2m
a) We know,✓
P.E = mgh
P.E = mgh= 200 × 9.8 × 2
P.E = mgh= 200 × 9.8 × 2=3920 J.✓
(b) Work done = Potential energy gained = 3920 J.✓
✔✔(Since, at any point above the surface of the ground, the work done in raising the body is numerically equal to the potential energy)✔✔
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